| Former (27) |
| Audit | 1986 – 1997 |
| Founder | 1986 – 2015 |
| Audit | 1986 – 1997 |
| Unofficial title | 1986 – 2006 |
| Founder | 1986 – 2015 |
| Unofficial title | 2008 – 2008 |
| Founder | 1986 – 2015 |
| Founder | 1986 – 2015 |
| Chief Executive Officer | 2006 – 2010 |
| Founder | 1986 – 2015 |
| Management | 2015 – 2015 |
| Deputy | 2011 – 2013 |
| Unofficial title | 2008 – 2010 |
| Founder | 1986 – 2015 |
| Chief Executive Officer | 2010 – 2015 |
| Founder | 1986 – 2015 |
| Unofficial title | 1986 – 2004 |
| Founder | 1986 – 2015 |
| Management | 1986 – 1997 |
| Founder | 1986 – 2015 |
| Founder | 1986 – 2015 |
| Unofficial title | 1999 – 2004 |
| Founder | 1986 – 2015 |
| Unofficial title | 1986 – 1995 |
| Unofficial title | 2008 – 2008 |
| Founder | 1986 – 2015 |
| Management | 1986 – 1989 |